direction of this finding contrasts with the notion of high externalizing individuals as hypersensitive to reward, it is notable that the reward stimulus in the current context (i.e., gain feedback cue) was highly symbolic. Thus it may be that individuals high in externalizing proneness are hypersensitive to immediate tangible reward, but diminished in their reactivity to distal, symbolic cues for reward. Future work could directly investigate this question by manipulating reward levels or context, and assessing variation in delta-P300 relative to externalizing proneness.
